Abstract
To understand how cells differentially use the dozens of myosin isozymes present in each genome, we examined the distribution of four unconventional myosin isozymes in the inner ear, a tissue that is particularly reliant on actin-rich structures and unconventional myosin isozymes. Of the four isozymes, each from a different class, three are expressed in the hair cells of amphibia and mammals. In stereocilia, constructed of cross-linked F-actin filaments, myosin-Iβ is found mostly near stereociliary tips, myosin-VI is largely absent, and myosin-VIIa colocalizes with crosslinks that connect adjacent stereocilia. In the cuticular plate, a meshwork of actin filaments, myosin-Iβ is excluded, myosin-VI is concentrated, and modest amounts of myosin-VIIa are present. These three myosin isozymes are excluded from other actin-rich domains, including the circumferential actin belt and the cortical actin network. A member of a fourth class, myosin-V, is not expressed in hair cells but is present at high levels in afferent nerve cells that innervate hair cells. Substantial amounts of myosins-Iβ, -VI, and -VIIa are located in a pericuticular necklace that is largely free of F-actin, squeezed between (but not associated with) actin of the cuticular plate and the circumferential belt. Our localization results suggest specific functions for three hair-cell myosin isozymes. As suggested previously, myosin-Iβ probably plays a role in adaptation; concentration of myosin-VI in cuticular plates and association with stereociliary rootlets suggest that this isozyme participates in rigidly anchoring stereocilia; and finally, colocalization with cross-links between adjacent stereocilia indicates that myosin-VIIa is required for the structural integrity of hair bundles.
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Dates
Type | When |
---|---|
Created | 23 years ago (July 26, 2002, 12:47 p.m.) |
Deposited | 2 years, 1 month ago (July 22, 2023, 2:57 a.m.) |
Indexed | 12 hours, 7 minutes ago (Aug. 24, 2025, 6:56 p.m.) |
Issued | 28 years, 2 months ago (June 16, 1997) |
Published | 28 years, 2 months ago (June 16, 1997) |
Published Online | 28 years, 2 months ago (June 16, 1997) |
Published Print | 28 years, 2 months ago (June 16, 1997) |
@article{Hasson_1997, title={Unconventional Myosins in Inner-Ear Sensory Epithelia}, volume={137}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.137.6.1287}, DOI={10.1083/jcb.137.6.1287}, number={6}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Hasson, Tama and Gillespie, Peter G. and Garcia, Jesus A. and MacDonald, Richard B. and Zhao, Yi-dong and Yee, Ann G. and Mooseker, Mark S. and Corey, David P.}, year={1997}, month=jun, pages={1287–1307} }